As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 600 HOUR INSPECTION GREASE IN DRIVE SHAFT HAD A RUSTY (BROWN) COLOR (NOTE: ANDEROL GREASE IS BLACK). UPON INSPECTION PART HAS 600.0 HOURS SINCE NEW. LIFE LIMIT OF 6000 HRS, THE SPLINES WERE WORN TO THE THICKNESS OF A PIECE OF PAPER (APPROX .090 NEW). SPECULATION OF MFG AND OUR FACILITY IS THAT THE GREASE WAS CONTAMINATED. FIRST 600 HOUR INSPECTION ON THIS AC, SAME GREASE SINCE DELIVERY. (K)